Article
Mechanics
Luigi Solazzi, Andrea Buffoli
Summary: The study demonstrates that hydraulic cylinders made of composite materials perform similarly to those made of structural steel in terms of safety factor, with a weight reduction of about 87%.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Yulin Wang, Huimin Li, Zi-Jia Tang, Fei Zhao, Dainnig Fang
Summary: With high specific strength and stiffness, composite orthogrid stiffened cylinders (COSC) have great potential in the aerospace industry. However, the traditional silicone mold preparation methods have limitations in manufacturing accuracy and mold reuse rate. This paper presents an improved COSC manufacturing method using a combined metal mold and prepreg laying process. The improved method enables the production of high-precision COSCs with intersection fillets.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Environmental
A. M. Neves, J. Puszkiel, G. Capurso, J. M. Bellosta von Colbe, T. Klassen, J. Jepsen
Summary: In this study, a comprehensive kinetic model was developed using the separable variable method to describe the dehydrogenation behavior of MgH2 and LiBH4 under different operative conditions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Polymer Science
Jiasu Li, Shuheng Wang, Gengyuan Zhang, Hongfei Li, Jun Sun, Xiaoyu Gu, Sheng Zhang
Summary: In this study, expandable graphite was encapsulated by poly-siloxane to prepare a flame retardant polypropylene composite. The composite achieved a high flame retardancy rating even at a low loading, and showed significantly reduced heat release during combustion. The burning behavior was investigated through experiments and numerical simulations, and the structure of the residual char was analyzed through chemical analysis and microscopy.
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Engineering, Multidisciplinary
Bart J. R. Smeets, Edward M. Fagan, Kelly Matthews, Robert Telford, Brendan R. Murray, Leonid Pavlov, Bryan Weafer, Patrick Meier, Jamie Goggins
Summary: This study focuses on the attachment point design for a lattice satellite central cylinder approximately 1.5 m in diameter, manufactured using composite prepreg fiber placement. The experimental testing validated the effectiveness of the design in reducing mass for primary aerospace structures.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Chemistry, Physical
Kutlu A. Oeztas, Klaas Kunze, Kumar Jois, Johannes Sackmann, Swen Zaremba, Michael G. Ruf
Summary: The use of shared vehicle architectures with BEVs offers a high potential for cost reduction in FCEVs. This study focuses on investigating the efficiency of a type I box-shaped pressure vessel for storing hydrogen. By reinforcing the vessel wall with fiber reinforced composite, the efficiency can be improved. The optimal design parameters derived from numerical analysis allow for comparison and evaluation of this vessel concept with other pressure vessel types.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Chemical
Yingji Bao, Binsong Jiang
Summary: This paper investigates the plastic deformation of rock and constructs an elasto-plastic incompatible model, while also examining the stress and deformation of a thick-walled cylinder under hydrostatic pressure using a finite element program. The results reveal a relationship between plastic strain and defect distribution, impacting the deformation of rocks.
Article
Polymer Science
Ange Lin, Jian Wu, Haohao Li, Zhe Li, Benlong Su, Youshan Wang
Summary: This study investigated the dynamic friction process of rubber seals and revealed the influence of geometric errors, such as roundness and straightness, on the friction characteristics. A numerical model of the friction and contact of rubber seals for the cylinder segment was developed using finite element simulation method. The synergy effects of roundness and straightness on the friction behavior of rubber seals considering geometric errors were also explored, laying a foundation for accurate prediction of cylinder dynamic mechanical properties.
Article
Mechanics
Y. Akkala, S. Daggumati
Summary: The research aims to develop a validated computational methodology to understand the failure behavior caused by ovalization in circular cross-sections of wind turbine rotor blades. Studies show that the induced ovalization leads to a non-linear relationship between the applied force and the radius of curvature until the collapse of the cylinder.
COMPOSITE STRUCTURES
(2023)
Article
Energy & Fuels
Fatih Selimefendigil, Hakan F. Oztop, Mikhail A. Sheremet
Summary: The study examines the impact of nanofluid jets on thermoelectric generation, finding that increasing jet Reynolds numbers and nanoparticle volume fractions can enhance power and efficiency. The horizontal distance between the jet inlet and the thermoelectric device also affects power generation and conversion efficiency, with smaller distances resulting in higher power generation but the optimum value for efficiency being at zh = 2.5ws. Regression models are developed for predicting generated power and conversion efficiencies.
Article
Chemistry, Physical
Xin Wei, Wei Zhang, Hanfeng Sun, Zeming Yuan, Qilu Ge, Yanghuan Zhang, Yan Qi
Summary: In this study, Mg95-xAl5Yx (x = 0-5) composites were successfully prepared to improve the sluggish kinetics and poor thermodynamics of Mg-based materials. The substitution of Y for Mg resulted in the formation of second phase Mg24Y5 and improved thermal stability. Additionally, the initial decomposition temperature of the Mg-Al-based alloy could be significantly reduced by the addition of yttrium.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Tianhang Yu, Yu Su, Jun Li, Huaqing Fu, Zhouxiang Si, Xiaopei Liu
Summary: This study investigated the stress-strain behavior and microstructural changes of Fe-Mn-Si-C twin-induced plasticity (TWIP) steel cylindrical components at different depths of deep drawing and after deep drawing deformation at various positions. The research revealed that the extent of grain deformation and structural defects gradually increased with increasing drawing depth. Different predominant textures were observed at different positions of the cylinder components.
Article
Chemistry, Multidisciplinary
Juyoung Kim, Julien O. Fadonougbo, Jee-Hwan Bae, Min Kyung Cho, Jaeyoung Hong, Young Whan Cho, Jong Wook Roh, Gyeung Ho Kim, Jun Hyun Han, Young-Su Lee, Jung Young Cho, Kyu Hyoung Lee, Jin-Yoo Suh, Dong Won Chun
Summary: This study reports real-time observations of the dehydrogenation of a Mg2FeH6-MgH2 composite using in situ transmission electron microscopy (TEM) with advanced spatial and temporal resolution. Through careful control and systematic variations of the reaction temperature and electron dose rate, the characteristic decomposition of Mg2FeH6 into Mg and Fe on the nanometer scale is visualized. The formation and growth of nanostructured Fe clusters in Mg metal during dehydrogenation are verified, and the desorption kinetics of the two coexisting phases are separately evaluated. These findings provide useful guidelines for designing hydrogen sorption conditions and improving solid-state hydrogen storage systems.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Composites
Wenbo Li, Hong Lv, Lijun Zhang, Pengfei He, Cunman Zhang
Summary: In this study, a progressive failure model is established for the burst of a hydrogen storage composite pressure vessel (CPV). The CPV's burst pressure and progressive damage behavior are analyzed, and surrogate models are created using kriging and response surface methods. The reliability and optimization design of the CPV are then analyzed using hybrid random-fuzzy uncertainties. The study shows that the CPV's hoop layer is the main load-bearing structure and that the response surface model is more computationally efficient for reliability analysis and optimization design. Increasing the longitudinal tensile strength, hoop layer thickness, and helical layer thickness improves the reliability of the CPV.
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
(2023)
Article
Engineering, Multidisciplinary
Kutlu A. Oeztas, Ruben A. J. Weerts, Michael G. Ruf
Summary: An analytical and numerical approach was used to determine the optimal design of a type I box-shaped pressure vessel with inner tension struts. The geometry and acting forces were analyzed to define a reference design, which served as a baseline for numerical studies to improve load handling through parameter studies. This efficient design process resulted in an optimized design based on the interaction of design parameters.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2021)
